I have the same problem. I can’t save anything on the general pipeline settings section. It always results in a 500 error. I think this is since I added the regular expression (which is wrong and I’m trying to change it.).

I also had problems saving anything in the general pipeline settings section. What I did to fix the problem:

1 - Erase the field value
2 - Save
3 - Error 500
4 - Go back to the project Settings, but this time, expand an other section (e.x.: Runner settings, Secret variables) and hit the save button in that panel
5 - Go back to the General pipeline settings and then when hitting save, it shouldn’t throw a 500 anymore and you will be able to Save